ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
June 2025
Nuclear Technology
Fusion Science and Technology
May 2025
Latest News
Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
S. Nagy, S. Daróczy, P. Raics, I. Boda, and I. Matajsz
Nuclear Science and Engineering | Volume 88 | Number 2 | October 1984 | Pages 154-163
Technical Paper | doi.org/10.13182/NSE84-A28399
Articles are hosted by Taylor and Francis Online.
Different empirical and semiempirical systematics have been developed to predict unmeasured fission product yields. One of these methods, originally proposed by Musgrove et al. and developed by Cook et al., is used to describe the energy dependence of the mass distribution in neutron-induced fission of 238U utilizing published yield data. The available measured cumulative yields of fission products are collected for monoenergetic 238U(n, f) processes. The mass distributions at approximate neutron energies of 1.5, 2.0, 3.0, 3.9, 5.2, 6.0, 7.0, 7.9, 9.0, and 14.7 MeV are fitted by the sum of five Gaussian functions. The energy dependence of the parameters of the Gaussian functions can also be described by semiempirical formulas. The 2σ error of the mass yields calculated by the fitted parameters can be estimated to be ∼10% in the peak regions and 20% in the valley region for the above neutron energies. The formulas with the given parameters can be useful in estimating unmeasured 238U fission product yields for any monoenergetic and nonmonoenergetic neutron irradiations in the range of 1.5 to 15 MeV. The method has been tested in a study of the 238U fission by neutrons having a Watt spectrum produced in the thermal fission of235U.